Ayatollah khamenei(Iran’s supreme leader):
"TATBIR (self-flagellation with knives or chains) is a fabricated tradition.
it is among the issues does NOT belong to the religion and undoubtedly God is NOT also pleased with such a practice...DO NOT PRACTICE IT! i do NOT approve of it."
Sadiq Shirazi Resident in England and Approved “Qama”(self harm)
 : " TATBIR (self-flagellation with knives or chains) is a fabricated tradition...){kind=link}